As WiFive said, Gpio12 must be pulled down at startup.

THANK YOU MUCH, you're right.
I am really stupid because I had read that on the datasheet but I had not made the connection between MTDI and GPIO12.
Everything is working properly!

Here is the part to lower the code.
And here is what I have as a message on the COM port (normal mode):
rst: 0x1 (POWERON_RESET), boot: 0x33 (SPI_FAST_FLASH_BOOT)
flash read err, 1000
ets_main.c 371
ands Jun 8 2016 00:22:57

rst: 0x10 (RTCWDT_RTC_RESET), boot: 0x33 (SPI_FAST_FLASH_BOOT)
flash read ...

Hello and thank you for your answer.
No nothing is connected to GPIO6-> GPIO11.
see diagram. I do not know what to do anymore.
Thanks for your help

Hello
I have a download problem with a ESP32 WROOM. l connects well but seems not to detect FLASH. Here is the error message.
I check everything, change the ESP but still the same.
Do you have an idea.
thank you in advance

Archiving built core (caching) in: C:\Users\Luc\AppData\Local\Temp\arduino ...